or the chittering chatter of a zebra finch song. We largely have the females of the species to thank for these. For most animals, females use more energy in reproduction than males — not just in ...

Identifying the male and female house from other Carpodacus finches requires care. The male house differs from the male purple finch not only by having a smaller, more curved bill, but also by ...

Zebra mussels, shown here on the left, have a life span of 2-5 years with a single female zebra mussel laying up to a million larvae a year. Besides competing with native mussels, show here on the ...